Express_1 Demo

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（本文为课程笔记）

首先新建node.js项目，控制台输入npm init，然后按需配置即可。

然后，添加module，按需添加即可。配置完成后，package.json文件如下：

{  "name": "webTest",  "private": true,  "devDependencies": {},  "engines": {    "node": ">=0.10.0"  },  "dependencies": {    "body-parser": "^1.15.0",    "express": "^4.13.4",    "morgan": "^1.7.0"  }}

配置文件中的三个module：用express来实现server；用morgan来帮助记录日志；用body-parser来转换数据格式与编码，以便js语法兼容。

demo里所有的后台操作全部略去，用字符串叙述表示，代码如下：

var express = require('express');var morgan = require('morgan');var bodyParser = require('body-parser');var hostname = 'localhost';var port = 3000;var app = express();app.use(morgan('dev'));var dishRouter = express.Router();dishRouter.use(bodyParser.json());dishRouter.route('/')    .all(function (req, res, next) {        res.writeHead(200, {            'Content-Type': 'text/plain'        });        next();    })    .get(function (req, res, next) {        res.end('Will send all the dishes to you!');    })    .post(function (req, res, next) {        res.end('Will add the dish: ' + req.body.name + ' with details: ' + req.body.description);    })    .delete(function (req, res, next) {        res.end('Deleting all dishes');    });dishRouter.route('/:dishId')    .all(function (req, res, next) {        res.writeHead(200, {            'Content-Type': 'text/plain'        });        next();    })    .get(function (req, res, next) {        res.end('Will send details of the dish: ' + req.params.dishId + ' to you!');    })    .put(function (req, res, next) {        res.write('Updating the dish: ' + req.params.dishId + '\n');        res.end('Will update the dish: ' + req.body.name +            ' with details: ' + req.body.description);    })    .delete(function (req, res, next) {        res.end('Deleting dish: ' + req.params.dishId);    });// the full path will be [ip]/dishes/[dishRouter]app.use('/dishes', dishRouter);// include some static resourcesapp.use(express.static(__dirname + '/public'));app.listen(port, hostname, function () {    console.log(`Server running at http://${hostname}:${port}/`);});

在控制台输入node [文件名] 运行server，然后就可以在浏览器或者postman里测试了。

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